Introduced OpenThreads::Affinity support into osg::Camera, osg::GraphicsContext::Traitse, osgDB::DatabasePager and osgViewer::ViewerBase/Viewer/CompositeViewer.

Added ViewerBase::configureAffinity() to help with the setting of the affinity of camera, graphics context and pager threads

include/osg/Camera

@@ -541,6 +541,11 @@ class OSG_EXPORT Camera : public Transform, public CullSettings
             }
         }
 
+        /** Set the process affinity hint for any Camera Threads that are/will be assigned to this Camera.*/
+        void setProcessorAffinity(const OpenThreads::Affinity& affinity);
+        OpenThreads::Affinity& getProcessorAffinity() { return _affinity; }
+        const OpenThreads::Affinity& getProcessorAffinity() const { return _affinity; }
+
         /** Create a operation thread for this camera.*/
         void createCameraThread();
 
@@ -707,6 +712,7 @@ class OSG_EXPORT Camera : public Transform, public CullSettings
 
         unsigned int                        _attachmentMapModifiedCount;
 
+        OpenThreads::Affinity               _affinity;
         ref_ptr<OperationThread>            _cameraThread;
 
         ref_ptr<GraphicsContext>            _graphicsContext;

include/osg/GraphicsContext

@@ -145,6 +145,9 @@ class OSG_EXPORT GraphicsContext : public Object
             bool overrideRedirect;
 
             DisplaySettings::SwapMethod swapMethod;
+
+            // hint of what affinity to use for any thrads associated with the graphics context created using these Traits
+            OpenThreads::Affinity affinity;
         };
 
         /** Simple resolution structure used by WindowingSystemInterface to get and set screen resolution.